[sourcekitd-test] When setting -fmodules-cache-path also set -fmodules #29437
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When doing header interface generation, we interpret clang command-line
arguments in
initInvocationByClangArguments
and attempt to setup amatching Swift compiler invocation. One important argument is the module
cache, but clang will only interpret
-fmodules-cache-path
if modulesare enabled (typically with
-fmodules
). While the header itself mightnot need modules, Swift will import its own shims module and during
testing this needs to honour lit's provided cache. So we add -fmodules
in sourcekitd-test anytime we add -fmodules-cache-path.
rdar://58836540